Вычислите:
а) $2\frac{1}{3} * 2$;
б) $4 * 1\frac{1}{2}$;
в) $1\frac{1}{3} * 9$;
г) $\frac{3}{7} * 2\frac{1}{3}$;
д) $1\frac{1}{3} * 1\frac{1}{2}$.
$2\frac{1}{3} * 2 = \frac{7}{3} * \frac{2}{1} = \frac{7 * 2}{3} = \frac{14}{3} = 4\frac{2}{3}$
$4 * 1\frac{1}{2} = \frac{4}{1} * \frac{3}{2} = \frac{4 * 3}{2} = \frac{2 * 3}{1} = 6$
$1\frac{1}{3} * 9 = \frac{4}{3} * \frac{9}{1} = \frac{4 * 9}{3} = \frac{4 * 3}{1} = 12$
$\frac{3}{7} * 2\frac{1}{3} = \frac{3}{7} * \frac{7}{3} = \frac{3 * 7}{7 * 3} = \frac{1 * 1}{1 * 1} = 1$
$1\frac{1}{3} * 1\frac{1}{2} = \frac{4}{3} * \frac{3}{2} = \frac{4 * 3}{3 * 2} = \frac{2 * 1}{1 * 1} = 2$